How are unique address in Bitcoin calculated?

[sm86]

I have seen this graph: https://blockchain.info/charts/n-unique-addresses . I see there is reduce in the number of the Unique address on many days. What would be the incentive for anyone to delete their address?

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[achow101]

Addresses cannot be deleted; in fact on a technical level, there are no addresses.

What that chart shows is how many unique addresses contains coins. Recently many people have been moving their coins to segwit wallets which means that they are consolidating their coins into fewer addresses. Furthermore, many people have been doing such consolidations to avoid paying higher fees in the future.

[nullius]

I have seen this graph: https://blockchain.info/charts/n-unique-addresses . I see there is reduce in the number of the Unique address on many days. What would be the incentive for anyone to delete their address?

There is no such thing as “deletion” of a Bitcoin address.  The page you link apparently pertains to the number of addresses whose associated private keys or scripts can spend outputs in the current UTXO set.  In colloquial terms:  All the addresses which can spend money right now.  When an address spends all the money it can, then it would disappear from that list.

(I can’t be certain of what the page contains, because it requires Javascript; and I’m not enabling that for this.  But that’s what it seems to be, from what I can see.)

[sm86]

Is there any way to get total number of addresses used so far in the Bitcoin Blockchain. Basically I want some numeric to use as a proxy for number of users In Bitcoin.

[shulio]

You can download the blockchain and analyze it to find how many unique addresses has been used up to now. It may take a while but it is not that hard to write a code to analyze.

[Xynerise]

Is there any way to get total number of addresses used so far in the Bitcoin Blockchain. Basically I want some numeric to use as a proxy for number of users In Bitcoin.

That's a terrible metric.
Addresses are created easily and most wallets do not allow for address reuse so you can't say that it's not just 10 people that have been using the bitcoin blockchain since 2009 with different addresses.

[therealbtcdave]

Wow that's a great graph.

It is funny, it has an export function but it only gives you a number per day.

It would be nice to get the actual addresses.